This release fixes a bug in previous software releases for the Duet 3 MB6XD with expansion boards, and supports the forthcoming Duet 3 MB6HC version 1.02 hardware revision. See https://github.com/Duet3D/RepRapFirmware/wiki/Changelog-RRF-3.x#reprapfirmware-343 for the change list.
The WiFi firmware (DuetWiFiServer.bin) and IAP files have not changed since the previous release. The Symbols archive files are for debugging use only.